Construction of a quantum repeater with linear optics
Construction of a quantum repeater with linear optics
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DOI：
10.1103/physreva.68.022301
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发表时间：
2003-08-01
影响因子：
2.9
通讯作者：
Dowling, JP
中科院分区：
文献类型：
--
作者：
Kok, P;Williams, CP;Dowling, JP
研究了利用双光子枪实现长距离光量子通信的高效量子中继器的机制和复杂性。这些枪可以根据需要产生偏振纠缠的光子对。一个这样的源可能是更小的量子点，其相对于参数下转换具有明显的优势，即创建光子对的概率接近于1，而创建多个光子对的概率为零。交换和净化部分由偏振分束器和概率光控非门实现。我们还表明，该中继器的效率的瓶颈是由于检测器的损失。
We study the mechanism and complexity of an efficient quantum repeater, employing double-photon guns, for long-distance optical quantum communication. The guns create polarization-entangled photon pairs on demand. One such source might be a semiconducter quantum dot, which has the distinct advantage over parametric down-conversion that the probability of creating a photon pair is close to 1, while the probability of creating multiple pairs vanishes. The swapping and purifying components are implemented by polarizing beam splitters and probabilistic optical controlled-NOT gates. We also show that the bottleneck in the efficiency of this repeater is due to detector losses.